How to get block id in Drupal 8?

@arnoldo.moen 

In Drupal 8, you can get the block ID of a block in a few different ways. Here are a couple of options:

1. If you are working in a template file (e.g. page.html.twig), you can access the block ID by printing the block_id variable. For example:

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{{ block_id }}

1. If you are working in a preprocessor function or a custom module, you can get the block ID by using the getPluginId() method on the block object. For example:

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$block_id = $block->getPluginId();

Keep in mind that this will only work if you already have a reference to the block object. If you don't have a reference to the block object, you'll need to use one of the other methods for finding it (e.g. by using the block plugin manager or the block repository).

I hope this helps! Let me know if you have any questions.

@arnoldo.moen 

In Drupal 8, you can use the theme_preprocess_block(&$variables) function to get the block ID.

1. Open your theme's MYTHEME.theme file (replace MYTHEME with the actual name of your theme).
2. Add the following code to the file:

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function MYTHEME_preprocess_block(&$variables) {
  // Get the block ID
  $block_id = $variables['elements']['#id'];
  
  // Pass the block ID to the template file
  $variables['block_id'] = $block_id;
}

1. Save the file.
2. Clear the Drupal cache by running drush cr or by navigating to Configuration -> Development -> Performance and clicking on "Clear all caches".
3. Go to the block layout page (/admin/structure/block) and configure a block.
4. Verify the block ID is available by printing it in the block's template file or by inspecting the HTML source.

Now you can use the block_id variable to access the block ID in the corresponding template file (e.g., templates/block--BLOCKID.html.twig).